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target/arm: use gen_goto_tb for ISB handling

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While an ISB will ensure any raised IRQs happen on the next
instruction it doesn't cause any to get raised by itself. We can
therefore use a simple tb exit for ISB instructions and rely on the
exit_request check at the top of each TB to deal with exiting if
needed.

Backports commit 0b609cc128ba5ef16cc841bcade898d1898f1dc3 from qemu
This commit is contained in:
Alex Bennée 2018-03-03 22:42:15 -05:00 committed by Lioncash
parent 0f8d216d67
commit 65356210a8
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 3 additions and 3 deletions
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2
qemu/target/arm/translate-a64.c
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@ -1435,7 +1435,7 @@ static void handle_sync(DisasContext *s, uint32_t insn,
* a self-modified code correctly and also to take
* any pending interrupts immediately.
*/
s->is_jmp = DISAS_UPDATE;
gen_goto_tb(s, 0, s->pc);
return;
default:
unallocated_encoding(s);

4
qemu/target/arm/translate.c
View file

@ -8336,7 +8336,7 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) // qq
* self-modifying code correctly and also to take
* any pending interrupts immediately.
*/
gen_lookup_tb(s);
gen_goto_tb(s, 0, s->pc & ~1);
return;
default:
goto illegal_op;
@ -10731,7 +10731,7 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
* and also to take any pending interrupts
* immediately.
*/
gen_lookup_tb(s);
gen_goto_tb(s, 0, s->pc & ~1);
break;
default:
goto illegal_op;